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Part VIII
Biology and Medicine
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RADIOBIOLOGICAL SURVEYS IN THE PACIFIC (UNCLASSIFIED)
Preliminary results of:some of the radiobiological surveys conducted
the July-September quarter are given below. These surveys, someof whigh
nthe Pacificduring
were still in prog-
‘ress at the end of the quarter, were undertaken to monitor the radicactivify in the water and in .
. marine’ organisms, resulting from Operation HARDTACK. The surveys w re described in detail in the Quarterly Progress Report, April—June 1958. ©
Fallout During Operation HARDTACK ©
. Highly radioactivefallout was imited to the announced danger area. Radiation doses to
members of the Joint. Task Force were kept toa minimum, and there werp no serious radiation -.
situations. .
a
Marine Radiobiologtcal Surveys
A radiobiological survey of the danger area conducted August g9—15
stricted area could be disestablished without hazard. A similar survey
ber 3—12 inthe area between Eniwetok and Guam, covering most of the
restricted area and extending a considerable distance beyond its weste
and plankton samples indicated that the radioactivity levels were of the
dicated that the re-
conducted Septem-
estern half of the
tude as those found in the post-REDWING survey in 1956. Further eval
was being made.
Tuna Sampling
.
By the end of September samples of tuna from about- 100 locations
the western and cen-
tral Pacific and 2 locations in the Indian Ocean had been sent to the La ratory of Radiation
Biology of the University of Washington for gross beta and gamma coun and analysis.. Most
st of the Eniwetok
of the tuna was caught in the areanorth of the equator, south of Japan,
test site, and east of the Philippines.- Counting of these samples reveal little radioactivity,
most of which could be accounted for by the naturally occurring radiois@tope potassium 40.
However, at a later time and in limited areas, some tuna may acquire
sbme radioactivity producedby the HARDTACK test, probably by way ofthe food chain.
SOIL SAMPLING AROUND THE NEVADA TEST SITE
Following Operation PLUMBBOB (1957) soil amples-were collect
TO NT Sata
strontium 90 fromareas around the Nevada Test Site (NTS) receiving
for analysis. for
me of the heaviest
Lassie =